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