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