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