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