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