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