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