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