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