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