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