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