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)(25,26,32,38)(27,34,28,33)(29,37,31,35)(30,36,40,39)(1,2,5,6)(3,4,7,8)(9,11)(10,15)(12,20)(13,22)(14,19)(16,24)(17,23)(18,21)(25,27,32,28)(26,33,38,34)(29,36,31,39)(30,35,40,37)(2,6)(3,7)(10,16)(11,19)(17,22)(18,20)(25,28,32,27)(26,34,38,33)(29,36,31,39)(30,35,40,37)(2,6)(3,7)(9,12)(10,17)(11,18)(13,15)(14,21)(16,22)(19,20)(23,24)(25,29,32,31)(26,35,38,37)(27,39,28,36)(30,34,40,33)(1,3)(2,4)(5,7)(6,8)(9,11)(10,15)(12,18)(13,17)(14,19)(16,24)(20,21)(22,23)(25,30)(26,36)(27,35)(28,37)(29,34)(31,33)(32,40)(38,39) 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)(25,31,32,29)(26,37,38,35)(27,36,28,39)(30,33,40,34)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.