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