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