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