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)(19,25)(20,33)(21,26)(22,27)(23,28)(24,29)(30,39)(31,40)(32,41)(34,42)(35,47)(36,43)(37,48)(38,45)(44,46)(1,3,4,8)(2,5,6,7)(17,19,30,35,21,34,38,46,22,20,23,32,24,31,36,37)(18,25,39,47,26,42,45,44,27,33,28,41,29,40,43,48)(10,13)(14,16)(17,20,22,19)(18,25,27,33)(21,34,24,31)(23,37,30,46)(26,40,29,42)(28,44,39,48)(32,38,35,36)(41,43,47,45)(2,6)(5,7)(9,11,12,15)(10,14,13,16)(17,21,22,24)(18,26,27,29)(19,31,20,34)(23,36,30,38)(25,40,33,42)(28,43,39,45)(32,46,35,37)(41,44,47,48)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.