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