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