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