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