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