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