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