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