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