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