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