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