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