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