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