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