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