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