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