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