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