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