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