It's hard to see the extent of damage, but it looks pretty severe. It's a hard situation to deal with, but I would probably euthanize it.
If you are unable/unwilling to do so; I would start by placing it in a humid, warm and VERY sterile container. Take a q-tip and and dip it in a iodine rinse and clean the area. If you can take the same q-tip and push it's organs in, that would be a positive step.