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