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