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