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