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