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