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