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)(11,16,20,24)(12,17,13,15)(19,22,21,23)(25,26)(27,30)(28,36)(29,33)(31,35)(32,37)(34,39)(38,40)(1,2)(3,6)(4,7)(5,8)(10,15)(12,13)(16,22)(17,18)(19,21)(23,24)(25,27,30,26)(28,34,38,32)(29,33,31,35)(36,37,40,39)(3,4)(6,7)(9,11)(10,16)(12,21)(13,19)(14,20)(15,22)(17,23)(18,24)(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)(9,12,14,13)(10,15,18,17)(11,19,20,21)(16,23,24,22)(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.