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