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