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