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