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