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