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