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