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)(11,16)(12,15)(13,14)(17,18,23,28)(19,24,32,40)(20,25,22,27)(21,26,35,43)(29,37,46,48)(30,38,36,44)(31,39,45,47)(33,41,34,42)(1,3,5,4)(2,6,7,8)(10,14)(15,16)(17,19,23,32)(18,24,28,40)(20,30,22,36)(21,29,35,46)(25,38,27,44)(26,37,43,48)(31,33,45,34)(39,41,47,42)(1,4,5,3)(2,6,7,8)(9,11,13,12)(10,15,14,16)(19,29)(20,22)(21,34)(24,37)(25,27)(26,42)(30,31)(32,46)(33,35)(36,45)(38,39)(40,48)(41,43)(44,47)(2,7)(6,8)(9,12,13,11)(10,16,14,15)(17,20,23,22)(18,25,28,27)(19,30,32,36)(21,33,35,34)(24,38,40,44)(26,41,43,42)(29,45,46,31)(37,47,48,39)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.