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