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