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