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