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