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