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