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