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