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