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