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