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