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