Class diagram?

Hi, I have a school assignement about a game I made in UE4, I'm almost done writing it but I have one small problem; I don't know how to organise Class Diagram according to unreal standards. can anyone help me with that? P.S: the game is an endless runner so there's not that many classes to put in the diagram, but I also don't know if I should put unreal default classes in the diagram with the blueprints I made