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