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