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