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