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