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