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