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