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