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