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