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