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