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