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