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