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