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