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