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