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