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