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