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