Well, he doesnt work with ever support, he usually works great with engaging supports, leona is probably the easiest way to win lane with Graves.
As for build, i usually start IE, into shoes (attack speed, CD or armor work great), after that PD, and death dance.
These i would consider core on him, it gives you burst, sustain, and durability to get in range against mages and other marksmen.
Last items depend on the enemy, they can be the last whisper items, black cleaver, maw, essance reaver or an extra BT, it all depends on the enemies.
One tip i really use a lot in lane is to not waste smoke screen, it's such a good tool against high ranged champs it gives you a lot of extra time to get close or get out of range to hit your burst.