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