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