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