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