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