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