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