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