One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,8)(4,6)(5,7)(17,18,22,26)(19,27,28,42)(20,24,31,39)(21,34,36,25)(23,35,37,30)(29,43,32,46)(33,48,45,41)(38,47,40,44)(1,3,5,4)(2,6,7,8)(9,10)(11,14)(12,13)(15,16)(19,28)(20,31)(23,37)(24,39)(27,42)(30,35)(33,45)(41,48)(10,13)(11,15)(17,19,22,28)(18,23,26,37)(20,32,31,29)(21,35,36,30)(24,40,39,38)(25,42,34,27)(33,44,45,47)(41,43,48,46)(9,11,12,15)(10,14,13,16)(17,20,22,31)(18,24,26,39)(19,29,28,32)(21,33,36,45)(23,38,37,40)(25,41,34,48)(27,43,42,46)(30,44,35,47)(1,4,5,3)(2,6,7,8)(10,13)(14,16)(20,31)(24,39)(29,32)(33,45)(38,40)(41,48)(43,46)(44,47)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.