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