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