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