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