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