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