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