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)(25,26,32,30)(27,36,38,33)(28,39,34,29)(31,35,37,40)(3,4)(7,8)(9,10)(11,15)(12,16)(13,17)(14,18)(19,22)(20,23)(21,24)(25,27)(26,33)(28,37)(29,40)(30,36)(31,34)(32,38)(35,39) involution — undirected(1,3,6,4)(2,7,5,8)(9,11)(10,13)(12,19)(14,17)(15,18)(16,21)(20,24)(22,23)(25,28)(26,29)(27,37)(30,39)(31,38)(32,34)(33,40)(35,36)(1,4,6,3)(2,7,5,8)(9,11)(10,15)(12,19)(13,18)(14,17)(16,22)(20,24)(21,23)(25,29,32,39)(26,34,30,28)(27,35,38,40)(31,33,37,36)(9,12,14,20)(10,16,18,23)(11,19,17,24)(13,21,15,22)(25,30,32,26)(27,36,38,33)(28,39,34,29)(31,40,37,35)(1,5,6,2)(3,8,4,7)(9,13,14,15)(10,17,18,11)(12,21,20,22)(16,24,23,19)(25,31)(26,35)(27,34)(28,38)(29,36)(30,40)(32,37)(33,39)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.