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