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