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