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