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