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