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