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