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