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