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I've had a lot of success jungling with Diana, but you can only gank real effectively after level 6, or if you surprise them with a lane gank.
I build her slightly hybrid with a focus on attack speed as this greatly helps assassinating people.
Start with boots + pots
Build 2x money items (Philo stone and heart of gold, due to low income of the jungle)
Finish boots into Berserker's greaves
Then I build a Rageblade, and finish off the razers i built by upgrading them to Bloodrazers.
From here, I build a Rylais, Deathcap, and a Lich Bane.
This build has proven itself to me as very powerful.