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