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)(20,28,30,32)(21,25,22,27)(24,31,26,29)(2,6)(4,7)(10,13)(11,15)(17,19,23,18)(20,26,30,24)(21,25,22,27)(28,29,32,31)(1,3,5,8)(2,7,6,4)(9,11,12,15)(10,14,13,16)(17,20)(18,24)(19,26)(21,29)(22,31)(23,30)(25,32)(27,28)(2,6)(3,8)(10,13)(14,16)(17,21,23,22)(18,25,19,27)(20,29,30,31)(24,32,26,28)(1,4,5,7)(2,8,6,3)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.