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