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