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