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