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