Early fall color is a sign of stress. Younger trees are more vulnerable and do it easier, but any tree will if stressed enough. Probably heat stress in much of the country right now. Keep the tree very well watered but not waterlogged. For a good sized tree that means put the hose on trickle and let it run all day, occasionally moving it around the tree. If it is really hot and you are not getting any rain, do that once every 7 - 10 days.
Coloring up means the tree is getting ready to go dormant, which is a survival tactic, conserves energy. It is always a good idea to give trees some good deep watering just when they are going dormant anyway, to help them get through the winter - just that would usually be later in the season.