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