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