From a former player directly, and then through others who talked to other players, Graham doesn't care about his players, their health, how they do in school, how they grow as young men, treats them like crap, etc. When he left TU he text the players goodbye from Pitt. He never told them in person he was leaving.
He did the same thing when he left Pitt for Arizona State after 1 year. His sole goal was to climb the coaching ranks and used his players to do it.
Now stories coming out of Hawai'i pretty much confirm he's a bigoted SOB.