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