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