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