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