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