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