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