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