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