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