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