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