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