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