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