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