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