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