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