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