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