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