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