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)(27,30)(28,33)(29,32)(31,36)(34,37)(35,40)(38,39)(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)(9,10,13,14)(11,15,18,20)(12,16,19,21)(17,22,23,24)(25,27,30,26)(28,33,36,31)(29,34,37,32)(35,40,38,39)(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)(25,28)(26,31)(27,33)(29,38)(30,36)(32,40)(34,39)(35,37)(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)(25,29,30,37)(26,32,27,34)(28,35,36,38)(31,39,33,40)(41,45,46,53)(42,48,44,52)(43,51,50,56)(47,54,49,55)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.