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