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