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