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