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