One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,4)(3,7,8,6)(9,10,12,14)(11,13,15,16)(17,18,20,22)(19,25)(21,24,28,31)(23,29)(26,32)(27,30)(1,3,5,8)(2,6,4,7)(9,11,12,15)(10,13,14,16)(18,22)(19,26)(24,31)(27,29)(1,4,5,2)(3,7,8,6)(11,15)(13,16)(21,28)(24,31)(25,32)(27,29)(3,8)(6,7)(17,19)(18,23)(20,26)(21,29)(22,30)(24,32)(25,31)(27,28) 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.