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