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