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