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