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