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