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