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