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)(11,13)(12,14)(15,16)(18,22)(23,25)(24,31)(26,32) involution — undirected(2,5)(6,8)(9,11,12,15)(10,13,14,16)(17,18,20,22)(19,26,27,32)(21,23,29,25)(24,30,31,28)(10,14)(13,16)(18,23)(21,29)(22,25)(24,26)(28,30)(31,32) involution — undirected(17,19,20,27)(18,24,22,31)(21,30,29,28)(23,26,25,32)(1,3,4,7)(2,6,5,8)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.