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