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