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