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