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