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