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