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