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