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