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