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