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