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