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)(11,14)(12,16)(13,15)(18,23)(20,29)(24,26)(25,30) involution — undirected(2,6)(7,8)(9,11,13,12)(10,14,15,16)(17,18,21,23)(19,25,27,30)(20,22,29,31)(24,32,26,28)(1,3,5,4)(2,7,6,8)(10,15)(14,16)(17,19,21,27)(18,24,23,26)(20,30,29,25)(22,32,31,28)(9,12,13,11)(10,16,15,14)(17,20)(18,22)(19,26)(21,29)(23,31)(24,27)(25,28)(30,32)(1,4,5,3)(2,8,6,7)(18,20)(22,31)(23,29)(24,30)(25,26)(28,32)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.