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