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