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