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