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