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