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