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