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