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