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