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