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