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