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