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