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