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