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