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