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