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