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