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