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