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