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