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