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