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