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