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