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