One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,5)(6,8)(9,10)(11,12)(13,16)(14,17)(15,18)(19,20)(21,23)(22,24)(25,26,32,35)(27,33,37,39)(28,38,29,34)(30,31,40,36)(2,5)(6,7)(9,11,15,13)(10,16,18,12)(14,19,22,21)(17,23,24,20)(25,27,32,37)(26,33,35,39)(28,36,29,31)(30,34,40,38)(1,2)(3,6)(4,5)(7,8)(25,28,32,29)(26,34,35,38)(27,36,37,31)(30,33,40,39)(1,3)(2,6)(4,8)(5,7)(9,12,15,16)(10,11,18,13)(14,20,22,23)(17,19,24,21)(25,29,32,28)(26,34,35,38)(27,31,37,36)(30,33,40,39)(9,13,15,11)(10,16,18,12)(14,19,22,21)(17,20,24,23)(25,30)(26,31)(27,34)(28,33)(29,39)(32,40)(35,36)(37,38)(9,14)(10,17)(11,19)(12,20)(13,21)(15,22)(16,23)(18,24)(25,31)(26,30)(27,28)(29,37)(32,36)(33,34)(35,40)(38,39) 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.