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