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)(17,18,23,25)(19,26,29,32)(20,22,30,21)(24,27,31,28)(2,5)(6,8)(9,11)(10,13)(12,15)(14,16)(17,19,22,28,23,29,21,27)(18,24,20,26,25,31,30,32)(1,3,4,7)(2,6,5,8)(11,15)(13,16)(17,20,22,25,23,30,21,18)(19,26,28,31,29,32,27,24)(11,15)(13,16) involution — undirected(10,14)(13,16)(17,21,23,22)(18,20,25,30)(19,27,29,28)(24,26,31,32)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.