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