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