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