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