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