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