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