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