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