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