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