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