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