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