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