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