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