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