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