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