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)(12,20)(13,14)(15,18)(16,22)(19,23)(21,24)(25,26)(27,28)(29,37)(30,34)(31,32)(33,38)(35,39)(36,40)(1,2,4,6)(3,7,8,5)(10,14)(15,17)(16,20)(23,24)(25,26,30,34)(27,31,32,28)(29,37,38,33)(35,36,40,39)(1,3)(2,5)(4,8)(6,7)(11,18)(15,17)(19,21)(23,24)(25,27,30,32)(26,31,34,28)(29,35,38,40)(33,39,37,36)(3,8)(5,7)(9,11,13,18)(10,15,14,17)(12,21,22,19)(16,24,20,23)(25,27)(26,31)(28,34)(29,35)(30,32)(33,39)(36,37)(38,40)(1,3)(2,5)(4,8)(6,7)(9,12,13,22)(10,16,14,20)(11,19,18,21)(15,23,17,24)(25,28,30,31)(26,32,34,27)(29,36,38,39)(33,40,37,35)(1,2)(3,5)(4,6)(7,8)(9,10)(11,15)(12,16)(13,14)(17,18)(19,23)(20,22)(21,24)(25,29)(26,33)(27,35)(28,36)(30,38)(31,39)(32,40)(34,37) 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.