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