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