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