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