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