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