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