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