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