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