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