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