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