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