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