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