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