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