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