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