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