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