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