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