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