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