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