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