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