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