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