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