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