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