It's not in the manual as far as i can see.
You could work it out from the cam lobes and knowing they will fire 240 degrees apart - 120 degrees on the cam. 1 - 3 - 2 is my best guess.
It's not been an issue for me because the leads are marked, and besides, it would be difficult to get them wrong due to the lengths out of the loom. #1 being the longest.
(You could swap 2 & 3 if you tried hard)
From the wiring diagram I always assumed that the markings of '1 '2 & '3 for both injectors and coils related directly to the cylinder numbers.
When you work it out, let us know!