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