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