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