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