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