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