Across 1,597 ranked games on patch 16.21 in Master and above, Graves mains win 50.3% of their games in the jungle.
Their most common build appears in 25.8% of those games and wins 49.0% of its 412 games.
It starts 
Scorchclaw Pup, completes 
Hubris, 
The Collector, 
Lord Dominik's Regards and 
Immortal Shieldbow in that order, and takes 
Boots.
Three other builds are played often enough in the jungle to be measured on their own.
In the jungle, Graves mains fare best against 
Ambessa (won 84.6% of 13 games), 
Lee Sin (won 64.6% of 65 games) and 
Kha'Zix (won 58.5% of 65 games).
Their hardest matchups, the champions that counter Graves, are 
Zyra (won 25.0% of 20 games), 
Shaco (won 18.2% of 11 games) and 
Viego (won 35.7% of 42 games).