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