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