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