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