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