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