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