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