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