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