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