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