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