S.L.
My oldest son was late talking and had speech therapy at about 4 yrs. old, I could be wrong but it wasn't after age 4, and he is now fine and talks with no problem. I think boys are slower sometimes at talking and especially the first child if, as was my problem, I knew what he wanted before he had to ask or speak. I wouldn't panic yet if I were you.
As for coloring, some kids don't like it. Some prefer to do other types of things and color only if they are asked to later. I think at this age you have time to wait and let him play and enjoy being a little boy before you get too concerned. Remember I may not like to do certain things even now that someone else does and finds enjoyable. I would say he's young and not ready. Maybe he never will like coloring and would prefer running a car on the floor for now.