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)(19,25)(20,23)(21,24)(22,27)(26,32)(28,31)(29,30)(2,4)(5,6)(7,8)(9,11,12,15)(10,13,14,16)(19,26)(21,28)(22,30)(24,31)(25,32)(27,29)(5,7,8,6)(17,19,20,27)(18,22,23,25)(21,29,28,26)(24,32,31,30)(10,14)(13,16)(18,23)(19,27)(24,31)(26,29) 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.