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