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