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