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