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