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