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