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