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