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