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