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