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