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