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