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