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)(11,15)(12,14)(13,16)(17,18)(19,26)(20,23)(21,24)(22,25)(27,32)(28,30)(29,31) involution — undirected(1,3,4,8)(2,5,6,7)(9,10,12,14)(11,13,16,15)(18,20)(21,26)(25,28)(29,32)(9,10)(11,13)(12,14)(15,16)(17,19)(18,21)(20,26)(22,27)(23,24)(25,29)(28,32)(30,31) involution — undirected(2,6)(5,7)(9,11)(10,13)(12,16)(14,15)(17,20,23,18)(19,26,24,21)(22,25,30,28)(27,29,31,32)(1,3)(2,5)(4,8)(6,7)(17,21,23,26)(18,24,20,19)(22,29,30,32)(25,31,28,27)(1,2)(3,5)(4,6)(7,8)(17,22)(18,25)(19,27)(20,28)(21,29)(23,30)(24,31)(26,32) 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.