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