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