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