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