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