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