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