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)(11,20)(12,16)(13,18)(14,19)(15,23)(17,22)(21,24)(25,26)(27,34)(28,32)(29,33)(30,38)(31,37)(35,39)(36,40) involution — undirected(2,5)(6,8)(9,11,14,12)(10,16,19,20)(13,22,15,21)(17,18,24,23)(25,27)(26,31)(28,36)(29,37)(30,35)(32,39)(33,34)(38,40)(9,12,14,11)(10,17,19,24)(13,22,15,21)(16,18,20,23)(27,35)(28,30)(31,39)(32,38)(34,40)(36,37)(1,3,4,7)(2,6,5,8)(9,13,14,15)(10,18,19,23)(11,21,12,22)(16,17,20,24)(25,28,29,30)(26,32,33,38)(27,36,37,35)(31,39,34,40)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.