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