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