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