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