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