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