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