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