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