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