There is a new path for jungles because the change of the exp at jungle and the 18% attack speed level 1, see patch 7.22, the attack speed you can see under champion chapter (it not include Rammus since patch 7.24).
To maximize the level 1 attack speed bonus you should start at wolfs, kill only the big one and 1 small wolf (better with leash), and then go to Blue, and kill the last wolf so the camp will be able to reset, I prefer this patch (As Warwick jungle): Wolf (only 2) > Blue > Gramp > Wolf > (scattle crab if you need more HP or mana) > Red > Raptors.
The trick with the Wolf should get you level 4 or 3 Before the lane does.
Blue > Wolves > Red or Red > Wolves > Blue is always a safe option. Xin Zhao has a great early game so I would recommend being as active as you can early on with scuttle control, deep wards, dueling and ganking rather than farming all your camps in a row. Maybe a more experienced Xin Zhao player can add more details, I'm afraid I haven't played him enough to know if he has any fancy route optimizations.
I don't play Xin Zhao but you can try it. (or watch pants are dragon's path on youtube)
To maximize the level 1 attack speed bonus you should start at wolfs, kill only the big one and 1 small wolf (better with leash), and then go to Blue, and kill the last wolf so the camp will be able to reset, I prefer this patch (As Warwick jungle): Wolf (only 2) > Blue > Gramp > Wolf > (scattle crab if you need more HP or mana) > Red > Raptors.
The trick with the Wolf should get you level 4 or 3 Before the lane does.