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