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