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