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