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