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