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