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