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