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