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