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