How to draw an ionic liquid?

Hi All,

I  am trying to draw an ionic liquic ((trihexyl)tetradecylphosphonium  bis(trifluoromethylsulfonyl)imide) and I stuck at point where I have to  assign the anion and the cation. I don’t know how to assign the negative  charge for one part and the positive charge for the other part.

Thanks,

Ahmed