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