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