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