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