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