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