You don't mention what his life/schedule was like before going to this preschool. I know that one of my nephews had a problem adjusting to daycare also. I think a lot of that had to do with the fact that he was at home with my SIL and his siblings, and was allowed to pretty much do what he wanted. When he got into a daycare (read - structured environment), where he had to get in line, wait his turn, sit still, and generally do what he was told for 8-10 hours a day it was a HUGE culture shock for him.
Perhaps you're right too that since your son has language delays AND is coming from a bi-lingual home it's not helping him either. Imagine how frustrated you'd be being dumped with "strangers" who are making the rules of you, being with kids you don't know and having a whole new schedule imposed on you. If he's not comfortable speaking his feelings (and many 3 yr olds can't), then acting out is all he has left.
I would suggest talking with the director and coming up with a "gameplan". Perhaps you can present it as, "I know that you've said that my son is disruptive. I really want him to learn how to focus and participate in the class activities. What can we do to get him there?"
Listen to what she has to say. Understand that she may seem a bit critical of your son since "he's" not going along with their programs. However, when it's your turn to talk, I think you have every right to tell her that it's their JOB to help them in this transition/adjustment period. That she can't keep complaining about his behavior. That there needs to be some kind of sticker chart, report card, etc at the end of the day that tells you SOME things he did well on, and SOME things he didn't. Then you should have something to talk about with him...like, "I don't want to hear from Ms. Diane that you pulled pictures off the wall today. That makes Mommy and Daddy sad. You need to listen to the teachers."
I think perhaps that by having some written report to go off of EACH DAY you will see your son's behavior in writing, instead of hearing her complain to you.
Then maybe you can agree with the director to meet with her weekly to see what's working and what's not for your son.
I hope you find this helpful.