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