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