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