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