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