One vertex per element, one color per generator, with an edge from x to x·s.
(2,6)(7,8)(9,10)(11,16)(12,17)(13,21)(14,15)(18,22)(19,23)(20,24)(25,26,29,31)(27,35,38,50)(28,33,40,45)(30,43,36,34)(32,46,44,39)(37,51,41,54)(42,56,52,49)(47,55,48,53)(1,2,5,6)(3,7,4,8)(10,15)(11,18)(12,13)(23,24)(26,31)(28,40)(32,44)(34,43)(35,50)(37,41)(42,52)(53,55)(1,3,5,4)(2,7,6,8)(9,11,14,18)(10,16,15,22)(12,20,13,19)(17,24,21,23)(25,27,36,46,29,38,30,39)(26,32,43,50,31,44,34,35)(28,41,52,53,40,37,42,55)(33,48,56,51,45,47,49,54)(1,4,5,3)(2,7,6,8)(9,12,14,13)(10,17,15,21)(11,19,18,20)(16,23,22,24)(25,28,29,40)(26,33,31,45)(27,37,38,41)(30,42,36,52)(32,47,44,48)(34,49,43,56)(35,51,50,54)(39,53,46,55)(9,13,14,12)(10,17,15,21)(11,19,18,20)(16,24,22,23)(28,40)(33,45)(37,41)(42,52)(47,48)(49,56)(51,54)(53,55)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.