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