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