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