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