IntroductionGraves is former Ad King and can be Ad king if played right. Graves posses one of the highest burst for Ad carries which makes him simply godly and pain in the effin ass to lane with. One point blank buckshot to the opposing ad carries or their support might just make them QQ. He is also has a good escape and a good mechanic skill to make him overall one of the best Ad carry.
MasteriesYou can also switch Havoc in Offence Tree to Vampirism. Personally Id take Havoc but its just my opinion.
Also I took some defence tree to get some hp and armor. Graves is so tanky for a ad carry its just ridiculus
You can also take Exaust/Flash or Cleanse/Flash depending on the situation.
Early Game/Mid Game/ Team FightsDuring this time of the game you should be wrecking peoples faces unless you had a horrid start.
In team fight, hit people that is nearest to you unless its a ramm
ConclusionGraves is King. Play it