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