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