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