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