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