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