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