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