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