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