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