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