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