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