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