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