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