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