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