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