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