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