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