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