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