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