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