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