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