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