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