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