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