The only thing you can do is hold 'left-click' to struggle against it. Though you'll lose everytime unless he is low on KI.
The only other ways to prevent getting thrown are to either:
A) Hold block before he hits you, he can still engage in advanced melee, but he will be unable to throw you.
B) Avoid getting hit (obvious enough).
C) Hit or throw him first.
Once he's thrown you, he'll usually have about half ki or less, and if you resist (left-click) then even less than that. If he throws you into the floor, you can hold down Jump to spring off, the same applies for walls. Use that second where he's recharging to launch a counter-attack.