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