The Diana build for Jungle is Jak'Sho, The Protean and Conqueror. This LoL Diana guide for Jungle at Platinum+ on 13.23 includes runes, items, skill order, and counters.
Diana Counters
51.4%
(-0.0%)
60.2%
(-3.1%)
6.0%
(+0.5%)
2.1%
(-0.3%)
753
(+31)