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