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