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