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