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