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