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