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