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