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