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)(11,13)(12,15)(14,16)(17,18)(19,23)(20,21)(22,24)(25,28)(26,27)(29,30)(31,32) involution — undirected(1,3)(2,5)(4,6)(7,8)(9,10,14,16)(11,13,15,12)(17,19,22,28)(18,23,24,25)(20,29,27,31)(21,30,26,32)(1,2)(3,8)(4,5)(6,7)(9,11,14,15)(10,12,16,13)(18,24)(19,28)(21,26)(29,31)(2,7)(3,4)(9,12,14,13)(10,11,16,15)(17,19)(18,25)(20,31)(21,30)(22,28)(23,24)(26,32)(27,29)(1,4,6,3)(2,5,7,8)(9,10)(11,12)(13,15)(14,16)(17,20,22,27)(18,26,24,21)(19,29,28,31)(23,32,25,30)(1,5)(2,3)(4,7)(6,8)(9,13,14,12)(10,15,16,11)(17,21,22,26)(18,27,24,20)(19,30,28,32)(23,31,25,29)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.