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