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