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