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