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