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