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