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