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