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