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