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