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