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