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