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