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