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