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