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