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