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