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