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