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