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