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