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