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)(17,18,22,26)(19,27,29,42)(20,31,32,46)(21,34,35,25)(23,36,38,30)(24,39,40,33)(28,43,44,37)(41,47,48,45)(2,6)(7,8)(10,14)(11,12)(17,19,21,30,22,29,35,36)(18,23,25,27,26,38,34,42)(20,28,33,45,32,44,39,47)(24,37,31,41,40,43,46,48)(1,3,5,4)(2,7,6,8)(9,11,13,12)(10,15,14,16)(17,20,21,33,22,32,35,39)(18,24,25,31,26,40,34,46)(19,28,30,45,29,44,36,47)(23,37,27,41,38,43,42,48)(1,4,5,3)(2,8,6,7)(11,12)(15,16)(20,32)(24,40)(28,44)(31,46)(33,39)(37,43)(41,48)(45,47)(9,12,13,11)(10,16,14,15)(19,29)(23,38)(27,42)(28,44)(30,36)(37,43)(41,48)(45,47)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.