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