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)(27,34)(28,32)(29,37)(30,31)(33,39)(35,36)(38,40)(2,6)(3,7)(9,11)(10,15)(12,18)(13,16)(14,20)(17,19)(21,24)(22,23)(26,31)(28,34)(33,37)(36,40) involution — undirected(1,3)(2,4)(5,7)(6,8)(12,22)(13,24)(16,21)(18,23)(25,27,30,32)(26,28,31,34)(29,38,39,35)(33,40,37,36)(1,4)(2,3)(5,8)(6,7)(9,12)(10,16)(11,18)(13,15)(14,22)(17,24)(19,21)(20,23)(25,27)(26,28)(29,35)(30,32)(31,34)(33,36)(37,40)(38,39) involution — undirected(9,11)(10,17)(12,23)(13,16)(14,20)(15,19)(18,22)(21,24)(25,28)(26,32)(27,31)(29,36)(30,34)(33,38)(35,37)(39,40) involution — undirected(9,13)(10,18)(11,16)(12,15)(14,24)(17,22)(19,23)(20,21)(25,29)(26,33)(27,35)(28,36)(30,39)(31,37)(32,38)(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.