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