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