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