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