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