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