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