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