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