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)(25,26,32,36)(27,31,33,28)(29,37,40,34)(30,35,38,39)(1,2)(3,6)(4,7)(5,8)(9,11,15,13)(10,16,18,19)(12,20,23,22)(14,21,17,24)(25,27,32,33)(26,28,36,31)(29,38,40,30)(34,39,37,35)(1,3)(2,5)(4,8)(6,7)(25,28,32,31)(26,33,36,27)(29,35,40,39)(30,34,38,37)(9,12)(10,17)(11,20)(13,22)(14,18)(15,23)(16,24)(19,21)(25,29)(26,34)(27,30)(28,35)(31,39)(32,40)(33,38)(36,37) 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)(26,35)(27,29)(28,34)(31,37)(32,38)(33,40)(36,39)(1,2)(3,5)(4,7)(6,8)(9,14,15,17)(10,12,18,23)(11,21,13,24)(16,20,19,22)(25,31,32,28)(26,33,36,27)(29,39,40,35)(30,34,38,37)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.