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