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