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