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