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