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