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