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