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