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