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