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