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