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