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