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