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