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