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