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