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