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