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