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