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