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