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