One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,8)(4,6)(5,7)(9,10,12,14)(11,15,16,13)(17,18,21,24)(19,25,20,23)(22,26,29,32)(27,30,28,31)(1,3,5,4)(2,6,7,8)(17,19,21,20)(18,23,24,25)(22,27,29,28)(26,31,32,30)(9,11,12,16)(10,13,14,15)(18,24)(19,27)(20,28)(22,29)(23,30)(25,31)(1,4,5,3)(2,6,7,8)(17,20)(18,25)(19,21)(22,28)(23,24)(26,30)(27,29)(31,32)(19,27)(20,28)(22,29)(23,31)(25,30)(26,32) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.