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