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