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)(19,28)(21,22)(25,32)(26,27)(29,31) involution — undirected(2,5)(3,7)(9,10)(11,15)(12,14)(13,16)(17,18,22,24,23,27,21,26)(19,29,30,32,28,25,20,31)(2,5)(6,8)(9,11,12,16)(10,13,14,15)(17,19,23,28)(18,25,27,29)(20,22,30,21)(24,31,26,32)(1,3,4,7)(2,6,5,8)(11,16)(13,15)(17,20)(18,25)(19,21)(22,28)(23,30)(24,32)(26,31)(27,29)(10,14)(13,15)(17,21,23,22)(18,26,27,24)(19,30,28,20)(25,31,29,32)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.