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