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