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