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