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