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