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