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