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