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)(11,15)(12,16)(13,17)(14,18)(19,23)(20,24)(21,22)(25,26,30,28)(27,33,34,31)(29,36,37,32)(35,38,40,39)(1,3,5,8)(2,6,4,7)(9,10,14,18)(11,16,12,15)(13,21,22,17)(19,23,20,24)(26,28)(27,34)(29,37)(38,39)(1,2,5,4)(3,6,8,7)(9,11,14,12)(10,15,18,16)(13,20,22,19)(17,24,21,23)(25,27,30,34)(26,31,28,33)(29,35,37,40)(32,38,36,39)(1,4,5,2)(3,7,8,6)(9,12,14,11)(10,16,18,15)(13,20,22,19)(17,24,21,23)(25,28,30,26)(27,31,34,33)(29,36,37,32)(35,38,40,39)(9,10)(11,15)(12,16)(13,17)(14,18)(19,23)(20,24)(21,22)(25,29)(26,32)(27,35)(28,36)(30,37)(31,38)(33,39)(34,40) involution — undirected(9,13)(10,17)(11,19)(12,20)(14,22)(15,23)(16,24)(18,21)(25,27)(26,33)(28,31)(29,35)(30,34)(32,39)(36,38)(37,40) involution — undirectedA 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.