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