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