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