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