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