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