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