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