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