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